Timing device



July 13, 1937.

C. T. STEIN TIMING DEVICE Filed Oct. 9, 1936 l 32 L W" i MF uw? u v M/.al EIQ 4,

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I8 i6 @HAR/.Es mow/,4S STE/M BY x j 1391: f E' A v ATFORNEYSv vitPatented ...lluly 13, 193x? PATENT oFFlcE acetate y immo nevica l 'Y kCharles Thomas Steiny lrieilevu"e9 Ky., assignee to The Wadsworth Watch@ase tlomnany,

Dayton9 Een, a corporation ci Kentucky Application @ctohcr 9,

f le (Cl. Zooms-i) My 'invention relates to a timing,7 device forelectric welding machines amiV particularly to those types or" Weldingmachines where the weltling operation is oi extremely sho-rt duration.For example, in the manufacture ci 'wa-tcn cases, certain lugsor ears:must be welded to the main body of the casing. These parts areextremely small in mass anol are of relatively high heat conf1 ductivequalities. l'or these reasons duration of the .Welding current must bevery short; it is so short that it is measured in. cycles or even in.

et time oi 1,410,011* a second; and periocls less than one cycle aresometimes usecl.

Various methods anni apparatus have been k ro esseci in the past foraccomplisl ne" 'the measure nient ci such short intervals ci time, hutier most part, they have. been for reason that they were extremelycomplicated very expensive. y

l't is an object oi nir invention th tc provide a device which willmeasure extremely short intervals of time with extreme accuracy. is'also an object o my invention to @soviele device, `as ,above outlin sl,which he very simple oi construction and therefore relatively cheap tomanufacture. Further objects oi :my invention include the provision ofmeans accurately predeterminata the durationl ol l timing operation toany traction of a cycle and to provide means whereby the circuit may beKarolien when instantaneous value of current equals zero so aste preventarcing.

` These and other objects of my inver tion which will he pointed outhereinafter or wl: will a33- pear to one skilled in the art upon readingthese specifications, il accomplish hy construction and arrangement or"parts oi which l shall clescribe a preferred embodiment. A

For a clearer understanding oi the invention7 reference is now made tothe drawing; Winch forms a part hereof and in Which- Figure l is a frontelevation ci a timing olevice in accordance with my invention.

Figure 2 is a horizontal cross sectional view taken along the line 2--2ci Fig. l.

Figure 3 is a horizontal cross sectional view taken on the line 3 3 ciFig. l.

Figure 4 shows an exemplary alternating current wave for the purpose vof indicating' at which point the circuit may loe broken.

Brley, in the practice of my irnfentiono l. erom the IO 1936, SerialiNo. @4591.2

viole a lead screa` which is continuously rota-tesi Toy asynchronousino-tor. Preferably, 'l rotate 'the lead screw at 3600 l. M. to the endthat one revolution thereof will represent one cycle oi alternatingcurrent. arrange a follower in a 5 position Where it may engage thethread o the leacl screw and 'l provide means for causing the engagementand for causing disengagement ot -ower from the lead screw. These meansare adjust-aisle so that any given-time dural0 tion wnag/:he present.connection with the tol loafer 'i provide z'ieans for closing a circuituson of with/the leacl screw and or @eenling the circuit unendisengagement. i so 'provide means preventmg a repeat actio" is mountedirl a ve nositiorl by meansfone hall hearings il wine' locate L tehrachets i3 and if;

i trarne ierner il?. yThe lead screw driven at 86Go Pt. P. M.

i6. Arranged. in a vertical lea-fl screw is a square roel l between thepivot screws and Q so as he capable ci oscillatory i me eer il carries asquare cella' ueh 1C provided with a screw 2i so that along the memberil may l ounted. on the roei i" a sleeve es, the lo ver g sition oi'which is limited hy 'the haiorenieation f collar 2U. The sleeve carriesthe ieaol screw the leac'. screw disengagine and. 'the circuit cio ,gmeans as will he described hereinatter.

For purpose ori-oscillating the roti it lir a the oscii nthereof7 .lhave vided which screwed o roel il, near the top. fr spring fastened eend of che 2li and `to the main trarne il), urges the roel il in aclockwise directionq @n the bracket i3, have provided a small hraclletwith an adjustable stop screw 2l' lor the nrcnose oi limiting" thecounter clockwise oscillation oi the il. fk

Upon the bracket i3 E have mounted a solenoid indicated generally havinga plunge-i 2Q. finleizterisiou 3@ of the solenoid plunger 2Q @trough anaperture in the arm 23 and is vided. with flanges Si 89. Between. thearni ariel the flange l have arranged a coil con-- oression spring for apurpose to he described hereinafter. The solenoid leads 'indicated gereleralltY 35i are connected to a control hutten or the like, to initiatethe weldingoiceratlonfat the will ci the operator.

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when the operator closes through leads 34, the plunger 23 will be drawninwardly and by means of the spring 33 and the arm 223, the rod il willbek oscillated in a counter clockwise direction until the arm 2li abutsthe stop screw 27. f Screwed to the sleeve 22 is an arm 35 which carriesa follower element which is held \:ln position by means of a set screwso that upon counter clockwise oscillation oi the rod lll, the followermember .Bc is adapted to enter the thread in the lead screw lll. It maybe, of course. that the instant that the follower member attempts toenter a thread in the lead screw may he opposite a raised portion butobviously it will e only an infinitesimal fraction of a second beiciethe spring 33 will force it into ythe groove ci' the thread. As soon asthe follower member enters a thread of the lead screw ld, it will tendtravel upwardly causing the sleeve d2 to slide upwardly along the rodlll. assembly, including the sleeve wardly until the follower itis thethread oi the lead screw, as scribed. f

Also mounted in a vertical position adjacent the rod lll is a rod whichcarries a conic cam the solenoid circuit will ride updisengaged fromwill now be demember which is held in any desired position by means of aset screw til. The sleeve 22 has screwed to it an arm il carrying asmall roller (it so that when the follower Sil enters the thread in thelead screw liLby virtue of counter clockwise oscillation of the rod lll,the roller t2 is broughtI into contact with the rod 33. As beforedescribed roller 42 meets the inclined surface of the conical cam member39 and begins to ride up the inc'lined surface thereof. This oscillatesthe rod in a clockwise direction until the follower 36 is disengagedfrom the thread in the lead screw ill. When this occurs, of course, theentire assembly on the sleeve 22 drops downwardly along the rod l ltoits initial resting place which is determined by the position of thecollar ifi). sary that the roller 42 ride on the rod 38, so long as saidroller is brought to such ment.

The welding contact is formed as follows: I have provided a vertical rod43 carrying a contact strip 44 and I have mounted by means of screws orthe like, on

the contact element 46 and that #this contact is ymaintained until thevfollower 36 is disengaged from the thread in the lead screw I0 by theaction of the cam member 39 upon the roller 42. By a vertical adjustmentof the cam me ber 39, a *position may be determined where the break ofcontacts occurs in one of the pointsmarked 0 (zero), in Fig. 4 wherebyarcing will be eliminated. It will be clear that, if I provide a leadscrew having a pitch of one-quarter inch and rotate the same at 36Q0 R.P. 'M., that each quarter inch movement of the 'sleeve member 22 and itsasso- Thus 'the entire the assembly rides upwardly until the It is notnecesa position that' the cam 39 will be effective to cause disengage-087,206 e From the above description,l it will be seen that elatedelements will represent a time interval of one cycle.

.fis shown in Fig. 2, I have provided means for preventing a repeataction. If the operator holds the push button closed yfor a periodlonger than the complete welding operation, the solenoid 28 willimmediately tend to cause a repetition of the welding operation. Inorder to prevent any such repetition. L' have provided a forked arm lllplvoted on the bracket 48 at 49. The forked portion of this arm isadapted to engage over the reduced portion 5l] oi the plunger extension.A spring 5l extending between the right-hand end of the arm dll and themain frame tends to hold the arm lll' in the position shown in Fig. 2.Also pivoted at lll is a notched arm i232 which is provided with a leafspring 53 which. bears against the righthand end of the arm. d?. Thearm` 4l is provided with a pin 5d which urges the notched arm. 52 towardthe right when the parts are in their normal position as shown in Fig.2.

The operation of this device is as follows:

When the solenoid 28 is energized and the plunger 23 is drawn inwardly,the shoulder 55 of the plunger extension abuts the forked portion of thearm All and oscillates it in a clockwise direction. The right endportion of the arm l acting against the leaf spring urges the notchedarm 52 in a clockwise direction. By the time this action occurs, ofcourse, the end of the arm 23 has passed the notch 52a. When the rod llis oscillated in a clockwise direction by the action of the cam 39, thearm 23 also moves in a clockwise direction until it passes the notch52a. energized, the tension in the spring 33 immediately tends to movethe arm 23 again in a counterclockwise direction. However by virtue ofthe construction above described, the end of the arm 23 engages in thenotch 52a so that a repeat operation is effectively prevented. As soonas the operator releases the push button the plunger y29 of the solenoidis released and the arm 23 then releases its pressure against thewelding circuit might` be established between the arm 24 and the stopscrew 21 if desired. It is therefore to be understood that I do notintend to limit myself otherwise than as stated in the claims whichfollow. l,

Having now fully described my invention, what I claim as new and desireto secure by Letters Patent, is:-

l. An electric timing devicecomprising an element rotating at constantspeed, an element adapted to be brought into engagement with saidrotating element for linear movement, means for causing said engagement,means for causing disengagement of said elements after any predeterminedlengthl of linear movement, and means operative during engagement forcompleting an electric circuit.

2. An electric timin ment rotating at synchronous speed, an elementadapted to be brought into engagement with said rotating element forlinear movement, means for causing said engagement,y means for causingdisengagement of said elements after any However, since the solenoid 28is still .it will be clear that changes may l g `device comprising anele- CTL ing element to be moved tieremz means fer entre ing seidengagement, fet' causing zitten gageme e" i6. etemente e, any prede erm*etnie timing devee eemprisng en @Eem sgme'xrenmte s i l means @new weyimned length oi movement, and `ineens operative during said engagementfor completing an electric eircuit.

1 6. A device foncausingthe energization of an electric circuit with apredetermined number of cycles of pulsating current, which comprisesmotive means driven synchronously .with said pulse-v Y 'i @nmeontroltngmeans moved thereby, and a cirnpening and dosing means engageable with nmovabe 'mf said controlling means, means for wringing said circuit@neming und closing means inte n position Sim' actuation by saidcontrolling eens, means :ietemmnng the time of engement ei seid ciment'opening and eosing erence te said eye-les, and nid Bren-it @neming and

